As the first anniversary of a Kansas City baby's disappearance approaches, police said they still haven't been able to talk again with the baby's mother, reported KMBC-TV.

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Lisa Irwin was reported missing on Oct. 4, 2011.

Kansas City police said they've investigated more than 1,600 leads in the case.

Irwin was last seen when her mother put her to sleep in her crib on the night of Oct. 3, 2011. Searches and attempts to find the baby, who would be 22 months old now, have proven unsuccessful.

Lisa's mother, Deborah Bradley, was the only adult in the house that night. Jeremy Irwin, the baby's father, was at work and returned home to find his daughter gone.

Police said at least one investigator and an FBI agent work on the case every day.

Police won't talk on camera about the investigation. In a press release, a department spokesman said unanswered questions still remain, and Bradley is the only one who has the answers.

Bradley was questioned in the early days of the investigation but has since told police she doesn't want to be interviewed any more.

Jeremy Irwin said he's still frustrated with police about the investigation.

Family attorney John Picerno said the statement from the police is unfair. He said police interrogated the parents for 30 hours.

"I don't know how much more involvement we can have. The thing they're looking for in their press release is some sort of one-on-one interrogation with a detective to interrogate Deborah to get some kind of confession and obviously that didn't work, initially," he said. "The one thing we can't allow to happen is an abusive and antagonistic interview process that took place early on."

The family has been putting up new flyers around the neighborhood. Many people close to them hope the anniversary will prompt a new interest and new clues.

Neighbor Dee Garrett said she thinks Lisa's parents are feeling optimistic as the milestone approaches.

"The first few times I'd seen her, she'd cry almost every time I'd talk to her, but now she's anxious to get her back," Garrett said. "I'm just thinking she is still alive and I'm hoping they will find her."

Deborah Bradley and Jeremy Irwin released a statement Monday about the case.

"We want to thank everyone for continuing to help look for Lisa and for the overwhelming support. Every day without her is hard and there is no such thing as normalcy anymore. Every day we wake up hoping it will be the day she comes home to us. Until that day happens our family will continue to be incomplete without her.

We have not lost hope and we will not give up until she is home where she belongs. We want to remind everyone that there is still a $100,000.00 reward for any information leading to Lisa. All tips are anonymous. We beg anyone that knows anything to please think of Lisa and help bring her home. Her two brothers are waiting for her to come home so they can play with her again.

If anyone wants to help raise awareness you can visit her website at www.FindLisaIrwin.com where there are printable flyers and pictures of Lisa."